<template>
  <div>
      <!-- 面包屑导航区域 -->
        <el-breadcrumb  separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
             <el-alert
                title="添加商品信息"
                type="info"
                show-icon :closable="false" center>
            </el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs tab-position="left" v-model="activeIndex" :before-leave="beforeLeaveTag" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="cateList"
                                :props="{ expandTrigger: 'hover',...catProps }"
                                @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                             <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!--
                             action表示图片要上传到后台的API地址
                             handlePreview 点击预览触发
                             handleRemove 删除图片
                             headers 请求头
                         -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            :headers="headersObj"
                            :on-success="handleSuccess"
                            :data="{name: 21}"
                            list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <el-button type="primary" class="btn-add" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewDialogVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>

  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      // 添加商品表单数据
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 商品图片
        pics: [],
        // 商品详情描述
        goods_introduce: '',
        // 动态参数  静态属性
        attrs: []
      },
      // 表单验证规则
      addFormRules: {
        goods_name: [{
          required: true, trigger: 'blur', message: '请输入商品名称'
        }],
        goods_price: [{
          required: true, trigger: 'blur', message: '请输入商品价格'
        }],
        goods_weight: [{
          required: true, trigger: 'blur', message: '请输入商品重量'
        }],
        goods_number: [{
          required: true, trigger: 'blur', message: '请输入商品数量'
        }],
        goods_cat: [{
          required: true, trigger: 'blur', message: '请输入商品名称'
        }]
      },
      // 商品分类数据
      cateList: [],
      // 分类级联选择器
      catProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://192.168.1.6:8888/api/private/v1/upload',
      // 图片上传组件headers的请求头对象
      headersObj: {
        Authorization: sessionStorage.getItem('token')
      },
      // 当前预览图片路径
      previewPath: '',
      // 当前图片预览弹窗显示或者隐藏
      previewDialogVisible: false
    }
  },
  created() {
    this.getCatList()
  },
  methods: {
    // 获取商品所有分类数据
    async getCatList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.$message.success('获取商品分类数据成功')
      this.cateList = res.data
    },
    // 级联选择器选中项变化，触发函数
    handleChange() {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeLeaveTag(activeName, oldActiveName) {
      // 如果oldActiveName === ”0“ 或者 商品分类不是三级
      console.log(activeName, oldActiveName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked() {
    //   console.log(this.activeIndex)
    // 访问动态参数面版
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get('categories/' + this.cateId + '/attributes', {
          params: { sel: 'many' }
        })

        if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')

        this.$message.success('获取参数列表成功')

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data
        console.log(res.data)
      } else if (this.activeIndex === '2') {
        // 访问静态属性面版
        const { data: res } = await this.$http.get('categories/' + this.cateId + '/attributes', {
          params: { sel: 'only' }
        })

        if (res.meta.status !== 200) return this.$message.error('获取静态属性列表失败')

        this.$message.success('获取静态属性列表成功')
        this.onlyTableData = res.data
        console.log(res.data)
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file)
      // 当前预览图片路径
      this.previewPath = file.response.data.url
      this.previewDialogVisible = true
    },
    // 处理图片移除效果
    handleRemove(file, fileList) {
      // console.log(file.response.data.tmp_path)
      //   1、获取将要删除图片的临时路径
      const filePath = file.response.data.tmp_path
      //   2、从pics数组中，找到这个图片的对应的索引值
      const index = this.addForm.pics.findIndex(item => {
        return item.pic === filePath
      })
      //   3、调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(index, 1)
    },
    // 监听上传图片成功事件
    handleSuccess(response) {
      if (response.meta.status === 200) {
        // 将图片信息对象push 到 pics 数组中
        this.addForm.pics.push({
          pic: response.data.tmp_path
        })
        return
      }
      this.$message.error('上传图片失败')
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项')
        // 执行添加的业务逻辑
        // lodash   cloneDeep(obj)
        // this.addForm  深拷贝对象
        const form = _.cloneDeep(this.addForm)

        form.goods_cat = this.addForm.goods_cat.join(',')

        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态参数
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('创建商品失败')

        this.$message.success('创建商品成功')

        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}
.previewImg {
    width: 100%;
}
.btn-add {
    margin-top: 15px;
}
</style>
